CN108696139B - Modularized input phase number-adjustable high-boost isolation type DC-DC converter - Google Patents
Modularized input phase number-adjustable high-boost isolation type DC-DC converter Download PDFInfo
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- CN108696139B CN108696139B CN201810575184.2A CN201810575184A CN108696139B CN 108696139 B CN108696139 B CN 108696139B CN 201810575184 A CN201810575184 A CN 201810575184A CN 108696139 B CN108696139 B CN 108696139B
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- 238000002955 isolation Methods 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims abstract description 155
- 238000000034 method Methods 0.000 abstract description 17
- 238000011217 control strategy Methods 0.000 abstract description 5
- 230000003071 parasitic effect Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 5
- 230000005284 excitation Effects 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
Modularized input phase number adjustable high boostAn isolated DC/DC converter. Compared with the existing scheme, the input phase number can be freely adjusted, and each input phase can automatically flow uniformly, so that the control strategy of the converter is simple. The first module of the proposed converter consists of an inductor, a main power switch and its drain-source parasitic capacitance, a clamp auxiliary switch and clamp capacitance, a transformer and its leakage inductance,n-1 capacitor and diode, the other modules each being an inductor, a main power switch and its drain-source parasitic capacitance, a clamp auxiliary switch and clamp capacitance, a transformer and its leakage inductance,nThe capacitor and the diode are formed by adjustingnThe input and output gain of the converter and the voltage stress of the switching device can be adjusted, and the current stress of the switching device in the converter can be adjusted through the adjustment of the number of modules. In addition, the switching tube in the converter realizes zero-voltage conduction and the diode realizes zero-current turn-off. The method is suitable for high-capacity high-gain boost conversion occasions requiring electrical isolation.
Description
Technical Field
The invention relates to an isolated DC-DC converter, in particular to a high-boost isolated DC/DC converter with adjustable modularized input phase number.
Background
In recent years, the development of offshore wind power generation technology is rapid, the direct current flow converging field of the offshore wind power generation technology generally needs tens of times or higher voltage gain, the processed power capacity is as high as several megawatts or higher, the existing scheme is difficult to be applied, and a converter with higher gain and capacity is needed.
In the prior art, the output voltage gain of the traditional boost type isolation converter is usually realized by enlarging the turns ratio of the primary winding and the secondary winding of the transformer, but on one hand, the design and the manufacturing difficulty of the high-capacity high-turns ratio high-frequency transformer are both large, and on the other hand, the problem of high voltage and current stress of a switching device is also caused. There are three main types of converters currently studied to address the above problems: the first is a double full-bridge DC/DC converter, which has the advantages of easy realization of soft switch, high power density, electric isolation and the like, but has the problems of small output voltage gain, difficult current sharing when a plurality of modules are connected in parallel and the like; the second type is a converter based on MMC technology, the stress of components is reduced through serial-parallel connection between sub-modules to realize high voltage boosting, the high modular structure of the converter can realize redundant control, and the reliability of the system is high, but the converter generally needs a complex control strategy and a relatively complex driving circuit; the third is LLC resonant converter, the transformer excitation inductance value of the converter has almost no influence on voltage gain, the selection design process of the magnetic element is greatly simplified, the conduction loss can be reduced by taking a larger excitation inductance value, but the converter also has the problem that the current sharing control strategy among the modules is complex when the multi-module parallel operation is carried out.
Disclosure of Invention
The method aims to solve the problems of high voltage and current stress, low input and output gain, difficult parallel operation of multiple modules and the like of devices in the existing high-capacity high-gain isolation type DC/DC converter. The invention provides a modularized high-boost isolation type DC/DC converter with an adjustable input phase number. The converter can adjust the current stress of components in the converter by adjusting modularized input phase numbers, and can adjust the input and output gain of the converter and the voltage stress of a switching device by adjusting the number of diodes and capacitors in each module. Meanwhile, the characteristic of automatic current sharing of each input phase simplifies the design of a control and driving circuit.
The technical scheme adopted by the invention is as follows:
a modularized high-boost isolation type DC/DC converter with adjustable input phase number comprises a DC input source, m modules and a diode D 0 Output filter capacitor C 0 Load R L 。
Wherein m modules are as follows:
the first module comprises an inductor L 1 Power switch S 1 Power switch S 1 Drain-source capacitance C VT1 Auxiliary switch S TC1 Clamping capacitor C C1 Leakage inductance L K1 Isolation transformer T 1 Diode D 12 、D 13 ···D 1n Capacitance C 12 、C 13 ···C 1n . Inductance L 1 One end of the capacitor is connected with the positive electrode of an input power supply, and the other end is connected with leakage inductance L K1 At the same time with the power switch S 1 Drain of (d) and clamp auxiliary switch S TC1 Source electrode of (a) is connected with a power switch S 1 Source of (C) and clamping capacitor (C) C1 The other end is connected with and then grounded, and the auxiliary switch S TC1 Drain of (C) and clamp capacitor C C1 One end is connected with leakage inductance L K1 And the other end of the transformer T 1 One end of the primary side is connected with a transformer T 1 One end of the secondary side and a diode D 21 Anode of (C) and capacitor C 12 、C 13 ···C 1n Is connected with the other end of the filter capacitor C o Load R L Is connected to the other end of the pipe. Diode D 12 Cathode and capacitor C of (2) 12 Is connected to one end of diode D 13 Cathode and capacitor C of (2) 13 Is connected to one end of a diode D 1n Cathode and capacitor C of (2) 1n Is connected to one end of the housing.
The second module comprises an inductor L 2 Power switch S 2 Power switch S 2 Drain-source capacitance C VT2 Auxiliary switch S TC2 Clamping capacitor C C2 Leakage inductance L K2 Isolation transformer T 2 Diode D 21 、D 22 ···D 2n Capacitance C 21 、C 22 ···C 2n . Inductance L 2 One end of the capacitor is connected with the positive electrode of an input power supply, and the other end is connected with leakage inductance L K2 At the same time with the power switch S 2 Drain of (d) and clamp auxiliary switch S TC2 Source electrode of (a) is connected with a power switch S 2 Source of (C) and clamping capacitor (C) C2 The other end is connected with and then grounded, and the auxiliary switch S TC2 Drain of (C) and clamp capacitor C C2 One end is connected with leakage inductance L K2 And the other end of the transformer T 2 One end of the primary side is connected with a transformer T 2 One end of the secondary side is provided with a capacitor C 21 、C 22 ···C 2n Is connected to the other end of diode D 21 Cathode and capacitor C of (2) 21 Is connected to one end of diode D 22 Cathode and capacitor C of (2) 22 Is connected to one end of a diode D 2n Cathode and capacitor C of (2) 2n Is connected to one end of the housing.
The third module comprises an inductor L 3 Power switch S 3 Power switch S 3 Drain-source capacitance C VT3 Auxiliary switch S TC3 Clamping capacitor C C3 Leakage inductance L K3 Isolation transformer T 3 Diode D 31 、D 32 ···D 3n Capacitance C 31 、C 32 ···C 3n . Inductance L 3 One end of the capacitor is connected with the positive electrode of an input power supply, and the other end is connected with leakage inductance L K3 At the same time with the power switch S 3 Drain of (d) and clamp auxiliary switch S TC3 Source electrode of (a) is connected with a power switch S 3 Source of (C) and clamping capacitor (C) C3 The other end is connected with and then grounded, and the auxiliary switch S TC3 Drain of (C) and clamp capacitor C C3 One end is connected with leakage inductance L K3 And the other end of the transformer T 3 One end of the primary side is connected with a transformer T 3 One end of the secondary side is provided with a capacitor C 31 、C 32 ···C 3n Is connected to the other end of diode D 31 Cathode and capacitor C of (2) 31 Is connected to one end of diode D 32 Cathode and capacitor C of (2) 32 Is connected to one end of a diode D 3n Cathode and capacitor C of (2) 3n Is connected to one end of the housing.
...
The module m comprises an inductance L m Power switch S m Power switch S m Drain-source capacitance C VTm Auxiliary switch S TCm Clamping capacitor C Cm Leakage inductance L Km Isolation transformer T m Diode D m1 、D m2 ···D nm Capacitance C m1 、C m2 ···C nm . Inductance L m One end of the capacitor is connected with the positive electrode of an input power supply, and the other end is connected with leakage inductance L Km At the same time with the power switch S m Drain of (d) and clamp auxiliary switch S TCm Is connected with the source electrode of the power switchS m Source of (C) and clamping capacitor (C) Cm The other end is connected with and then grounded, and the auxiliary switch S TCm Drain of (C) and clamp capacitor C Cm One end is connected with leakage inductance L Km And the other end of the transformer T m One end of the primary side is connected with a transformer T m One end of the secondary side is sequentially connected with the capacitor C m1 、C m2 ···C nm Is connected with the other end of diode D m1 Cathode and capacitor C of (2) m1 Is connected to one end of diode D m2 Cathode and capacitor C of (2) m2 Is connected to one end of a diode D mn Cathode and capacitor C of (2) mn Is connected to one end of the housing. Diode D mn Cathode and capacitor C of (2) mn And diode D 0 Is connected to the anode of the battery.
The connection relation between the modules is as follows: transformer T in first module 1 One end of the secondary side is provided with a capacitor C 12 The node between the other ends is connected with a diode D in a second module 21 Diode D in the first module 12 Cathode and C 12 The node between one end is connected with the diode D in the second module 22 Diode D in the first module 13 Cathode and C 13 The node between one end is connected with the diode D in the second module 23 The anode of the first module, diode D, and so on 1n Cathode and capacitor C of (2) 1n The node between one end is connected with the diode D in the second module 2n Is a positive electrode of (a).
Diode D in the second module 21 Cathode and C 21 The node between one ends is connected with the diode D in the module III 31 Diode D in the second module 22 Cathode and C 22 The node between one ends is connected with the diode D in the module III 32 Anode, and so on, diode D in the second module 2n Cathode and C 2n The node between one ends is connected with the diode D in the module III 3n And an anode.
Similarly, diode D in the m-1 th module m-11 Cathode and capacitor C m-11 The node between one ends is connected with the diode D in the module m m1 Anode of (m) 1 stDiode D in module m-12 Cathode and capacitor C m-12 The node between one ends is connected with the diode D in the module m m2 Diode D in the m-1 th module, and so on m-1n Cathode and capacitor C of (2) m-1n The node between one ends is connected with the diode D in the module m mn Is a positive electrode of (a).
Diode D in mth module m1 Cathode and capacitor C m1 The node between one end is connected with diode D in module one 12 Diode D in the mth module m2 Cathode and capacitor C m2 The node between one end is connected with diode D in module one 13 The anode of (D) in the m-th module, and so on mn-1 Cathode and capacitor C mn-1 The node between one end is connected with diode D in module one 1n Is a positive electrode of (a).
Load R L And C 0 Parallel, load R L One end connected with diode D 0 The other end of the cathode is connected to a module-one middling pressure device T 1 One end of the secondary side is provided with a capacitor C 12 Nodes between the other ends. Diode D 0 Anode and diode D of (c) mn Cathode and capacitor C of (2) mn Is connected to the node between the ends of the pair. The other ends of the primary sides and the secondary sides of the transformers between the modules are connected together.
M power switches S of the converter 1 、S 2 ...S m The grid electrodes of the auxiliary switches S are respectively connected with respective controllers TC1 、S TC2 ...S TCm The grid electrodes of the power switches S are also respectively connected with the respective controllers, and the subscript is odd 1 、S 3 Control signals are consistent, and the subscripts are even power switches S 2 、S 4 The control signals are identical and the two are 180 degrees out of phase, and the auxiliary clamp switch is complementarily conducted with the power switch of the corresponding branch.
The invention provides a modularized high-boost isolation type DC/DC converter with adjustable input phase number, which has the following technical effects:
1. the input and output gain is high and adjustable, and the voltage and current stress of the switching device is low and adjustable. Wherein:
the ratio of the output voltage to the input voltage is:
the voltage stress of the switching tube is as follows:
the voltage stress of the diode is:
the voltage stress of the output diode is:
the current stress of the switching tube is as follows:
current stress of diode
Wherein: d is the duty cycle; m is the input phase number; n is the number of diodes, or capacitors, in the module; n is the transformer parameter ratio.
2. The automatic current sharing can be realized among all the modules, and the control strategy and the driving circuit are simple.
3. All the switching tubes are conducted with zero voltage, the diodes are turned off with zero current, and the working efficiency of the converter is high.
Drawings
Fig. 1 is a schematic general diagram of the circuit of the present invention.
Fig. 2 is a circuit topology diagram of the present invention with n=2 and m=4.
FIG. 3 shows a main switch S of the present invention 1 、S 2 Driving signal, voltage, current waveform diagram.
FIG. 4 shows an auxiliary switch S of the present invention TC1 、S TC2 Driving signal, voltage, current waveform diagram.
FIG. 5 is the presentInventive clamping capacitor V CC1 、V CC2 Voltage waveform and input and output voltage waveform diagrams.
FIG. 6 shows an inductor I according to the invention L1 、I L2 Current and leakage inductance I LK1 、I LK2 Current waveform diagram.
FIG. 7 shows a capacitor C according to the present invention 21 ～C 42 Voltage waveform diagram.
FIG. 8 shows a diode D according to the invention 21 、D 31 Voltage current waveform diagram.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in FIG. 2, a modular 4-input phase-number isolated DC/DC converter comprises 4 modules, 4 input phases, 4 inductors L 1 、L 2 、L 3 、L 4 4 power switches S 1 、S 2 、S 3 、S 4 4 power switch drain-source capacitance C VT1 、C VT2 、C VT3 、C VT4 4 auxiliary switches S TC1 、S TC2 、S TC3 、S TC4 4 clamping capacitors C C1 、C C2 、C C3 、C C4 4 transformers, 8 capacitors C 0 、C 12 、C 21 、C 31 、C 41 、C 22 、C 32 、C 42 8 diodes D 0 、D 12 、D 21 、D 31 、D 41 、D 22 、D 32 、D 42 ；
Wherein: of the 4 modules, one of them was used,
the first module comprises an inductor L 1 Power switch S 1 Power switch S 1 Drain-source capacitance C VT1 Auxiliary switch S TC1 Clamping capacitor C C1 Leakage inductance L K1 Isolation transformer T 1 Diode D 12 Capacitance C 12 . Inductance L 1 One end of the capacitor is connected with the positive electrode of an input power supply, and the other end is connected with leakage inductance L K1 At the same time with the power switch S 1 Drain of (d) and clamp assistSwitch S TC1 Source electrode of (a) is connected with a power switch S 1 Source of (C) and clamping capacitor (C) C1 The other end is connected with and then grounded, and the auxiliary switch S TC1 Drain of (C) and clamp capacitor C C1 One end is connected with leakage inductance L K1 And the other end of the transformer T 1 One end of the primary side is connected with a transformer T 1 One end of the secondary side and a diode D 21 Anode of (C) and capacitor C 12 Is connected with the other end of the filter capacitor C o Load R L Is connected to the other end of the pipe. Diode D 12 Cathode and capacitor C of (2) 12 Is connected to one end of the housing.
The second module comprises an inductor L 2 Power switch S 2 Power switch S 2 Drain-source capacitance C VT2 Auxiliary switch S TC2 Clamping capacitor C C2 Leakage inductance L K2 Isolation transformer T 2 Diode D 21 、D 22 Capacitance C 21 、C 22 . Inductance L 2 One end of the capacitor is connected with the positive electrode of an input power supply, and the other end is connected with leakage inductance L K2 At the same time with the power switch S 2 Drain of (d) and clamp auxiliary switch S TC2 Source electrode of (a) is connected with a power switch S 2 Source of (C) and clamping capacitor (C) C2 The other end is connected with and then grounded, and the auxiliary switch S TC2 Drain of (C) and clamp capacitor C C2 One end is connected with leakage inductance L K2 And the other end of the transformer T 2 One end of the primary side is connected with a transformer T 2 One end of the secondary side is provided with a capacitor C 21 、C 22 Is connected to the other end of diode D 21 Cathode and capacitor C of (2) 21 Is connected to one end of diode D 22 Cathode and capacitor C of (2) 22 Is connected to one end of the housing.
The third module comprises an inductor L 3 Power switch S 3 Power switch S 3 Drain-source capacitance C VT3 Auxiliary switch S TC3 Clamping capacitor C C3 Leakage inductance L K3 Isolation transformer T 3 Diode D 31 、D 32 Capacitance C 31 、C 32 . Inductance L 3 One end of the power source is connected with the positive electrode of the input power source, and the other end is connected with the drainSense of L K3 At the same time with the power switch S 3 Drain of (d) and clamp auxiliary switch S TC3 Source electrode of (a) is connected with a power switch S 3 Source of (C) and clamping capacitor (C) C3 The other end is connected with and then grounded, and the auxiliary switch S TC3 Drain of (C) and clamp capacitor C C3 One end is connected with leakage inductance L K3 And the other end of the transformer T 3 One end of the primary side is connected with a transformer T 3 One end of the secondary side is provided with a capacitor C 31 、C 32 Is connected to the other end of diode D 31 Cathode and capacitor C of (2) 31 Is connected to one end of diode D 32 Cathode and capacitor C of (2) 32 Is connected to one end of the housing.
The fourth module comprises an inductor L 4 Power switch S 4 Power switch S 4 Drain-source capacitance C VT4 Auxiliary switch S TC4 Clamping capacitor C C4 Leakage inductance L K4 Isolation transformer T 4 Diode D 41 、D 42 Capacitance C 41 、C 42 . Inductance L 4 One end of the capacitor is connected with the positive electrode of an input power supply, and the other end is connected with leakage inductance L K4 At the same time with the power switch S 4 Drain of (d) and clamp auxiliary switch S TC4 Source electrode of (a) is connected with a power switch S 4 Source of (C) and clamping capacitor (C) C4 The other end is connected with and then grounded, and the auxiliary switch S TC4 Drain of (C) and clamp capacitor C C4 One end is connected with leakage inductance L K4 And the other end of the transformer T 4 One end of the primary side is connected with a transformer T 4 One end of the secondary side is sequentially connected with the capacitor C 41 、C 42 Is connected with the other end of diode D 41 Cathode and capacitor C of (2) 41 Is connected to one end of diode D 42 Cathode and capacitor C of (2) 42 Is connected to one end of the housing. Diode D 42 Cathode and capacitor C of (2) 42 And diode D 0 Is connected to the anode of the battery.
The connection relation between the modules is as follows: transformer T in first module 1 One end of the secondary side is provided with a capacitor C 12 The node between the other ends is connected with a diode D in a second module 21 Anode of the first dieDiode D in block 12 Cathode and C 12 The node between one end is connected with the diode D in the second module 22 Is a positive electrode of (a).
Diode D in the second module 21 Cathode and C 21 The node between one ends is connected with the diode D in the module III 31 Diode D in the second module 22 Cathode and C 22 The node between one ends is connected with the diode D in the module III 32 And an anode.
Diode D in the third Module 31 Cathode and capacitor C 31 The node between one end is connected with diode D in the fourth module 41 Diode D in the third module 32 Cathode and capacitor C 32 The node between one end is connected with diode D in the fourth module 42 Is a positive electrode of (a).
Diode D in fourth Module 41 Cathode and capacitor C 41 The node between one end is connected with diode D in module one 12 Is a positive electrode of (a).
Load R L And C 0 Parallel, load R L One end connected with diode D 0 The other end of the cathode is connected to a module-one middling pressure device T 1 One end of the secondary side is provided with a capacitor C 12 Nodes between the other ends. Diode D 0 Anode and diode D of (c) 42 Cathode and capacitor C of (2) 42 Is connected to the node between the ends of the pair. The other ends of the primary sides and the secondary sides of the transformers between the modules are connected together.
2. 4 power switches S according to 1 1 、S 2 、S 3 、S 4 The gates of the power switches S1 and S3 are respectively connected with respective controllers, the control signals of the power switches S2 and S4 are consistent, and the phases of the power switches S1 and S3 are 180 degrees different.
To simplify the analysis process, it is assumed that: (1) inductor current I L1 、I L2 、I L3 、I L4 Continuous; (2) capacitor C 0 ～C 8 Is large enough that the voltage thereon remains unchanged; (3) all devices are ideal devices, and influence of parasitic parameters and the like is not considered; (4) the resonance period between the clamping capacitor and the leakage inductance is far longer than that of the switchClosing the off time and ignoring the voltage ripple on the clamp capacitor; (5) the active switch adopts an interleaving control strategy, and the switch duty ratio D>0.5; (6) auxiliary switch S TC1 、S TC2 、S TC3 、S TC4 Complementary to the main switch of the respective branch, and the main switch and the corresponding auxiliary switch leave sufficient dead time when switching.
Depending on the power switch state, in a switching period T S The circuit can be divided into 21 operating states (since the other input phases have the same loop state, only the operating state of the first input phase is analyzed here):
(1) State 1 (t) 0 ～t 1 ). Power switch S 1 、S 2 All are conducted, and at the moment, the input power supply passes through the power switch S 1 、S 2 Respectively to the inductance L 1 、L 2 Charging, I L1 、I L2 The linear rise under the excitation of the input power supply Uin; transformer secondary diode D 21 、D 31 、D 41 、D 11 、D 22 、D 32 、D 42 、D 0 All turn off, auxiliary switch V TC1 、V TC2 All turn off, clamp capacitor C C1 、C C2 The voltage on the capacitor is kept unchanged, and the filter capacitor C is output O Independently supply power to load and output voltage u o Descending.
(2) State 2 (t) 1 ～t 2 ). At t 1 Time power switch S 1 Is turned off by the driving signal of (a) and (b) is a power switch S 2 Keep on, inductor current I L2 Continuing to linearly rise under the excitation of an input power supply; inductor current I L1 Direction switch S 1 Drain-source capacitance C of (2) VT1 Charging due to capacitance C VT1 Is limited by the presence of switch S 1 The rising speed of the drain-source voltage can effectively reduce the switch S 1 Is a turn-off loss of (2); the process continues until the capacitance C VT1 The voltage on rises to u o And ending at/(8N), wherein N is the transformer transformation ratio.
(3) State 3 (t) 2 ～t 3 ). At t 2 Time switch S 1 Drain-source electrodeCapacitor C VT1 The voltage on rises to u o /(8N), diode D 21 、D 22 Conduction, the secondary side induction current of the transformer passes through D 21 Give electric capacity C 21 Charging while passing through diode D 22 Give electric capacity C 22 Charging, capacitor C 12 And (5) discharging. Leakage inductance current I LK1 Starts to rise but due to leakage inductance L k1 Is present in (I) LK1 The rising speed is limited, and therefore diode D 21 、D 22 Approximately zero current conduction is achieved. Inductor current I L1 Continuing to be capacitor C VT1 Charging, the process continues until the capacitance C VT1 The voltage on rises to U CC1 And (5) ending. Due to capacitance C VT1 Is very small and therefore rises from the leakage current to the capacitance C VT1 Terminal voltage U CC1 The process of (2) is short, so that the influence of the process can be ignored in the analysis of the circuit performance, and the leakage inductance current I is considered Lk1 Time of rise and capacitance C VT1 Terminal voltage is covered by capacitor C C1 The moments of clamping are uniform. (4) State 4 (t 3 to t 4). Capacitor C at time t3 VT1 The terminal voltage rises to U CC1 Auxiliary switch S TC1 Is turned on due to the clamp capacitance C C1 Relative capacitance C VT1 Is large in terms of magnitude and therefore a large proportion of the inductor current I L1 Into the clamping capacitor C C1 In the switch tube S 1 The drain-source voltage is clamped at U CC1 And from this moment on the leakage inductance L k1 Clamping capacitor C C1 And the secondary capacitor of the transformer forms a resonant circuit, and the voltage ripple of the secondary capacitor of the transformer is negligible because the secondary capacitor of the transformer is designed to be large enough, so that the secondary capacitor of the transformer can be equivalent to a constant voltage source when analyzing the resonance process. This resonance period and leakage inductance L k1 And a clamping capacitor C C1 Related to the value of (neglecting capacitance C VT1 And the resonance period must be large enough to ensure reliable operation of the circuit. The resonance process continues until t 4 Time (auxiliary switch S) TC1 The drive signal comes) to end.
(5) State 5 (t) 4 ～t 5 ). At t 4 Time auxiliary switch S TC1 To the drive signal of (2)Since the body diode is turned on in advance, the auxiliary switch S TC1 Zero voltage turn-on is realized; leakage inductance current I in this state Lk1 Approximately linearly rise, the process continues to I Lk1 Rising to inductor current I L1 And ending the process.
(6) State 6 (t) 5 ～t 6 ). At t 5 Time leakage inductance current I Lk1 Rising to inductor current I L1 Clamping capacitor voltage u CC1 Stop rising and start to induce leakage L k1 Discharging, leakage inductance current I Lk1 Continues to rise, the process continues to the auxiliary switch S TC1 Ending at turn-off.
(7) State 7 (t) 6 ～t 7 ). At t 6 Time auxiliary switch S TC1 Is turned off, capacitor C VT1 The presence of (2) limits the switch S TC1 The rising rate of the terminal voltage can effectively reduce the switch S TC1 After which the clamping capacitor C C1 Out of the resonant circuit, only the remaining switches S 1 Drain-source capacitance C VT1 Independent leakage inductance L k1 Resonance discharge, which continues to capacitor C VT1 The upper voltage drop ends up to uo/(8N).
(8) State 8 (t) 7 ～t 8 ). At t 7 Time capacitor C VT1 The voltage on the capacitor drops to uo/(8N), and leakage inductance L k1 Terminal voltage is reversed, leakage inductance current I Lk1 Reach maximum and begin to drop at that moment, capacitance C VT1 Through leakage inductance L k1 Continue discharging, the process continues until capacitor C VT1 The voltage on drops to 0.
(9) State 9 (t) 8 ～t 9 ). At t 8 Time capacitor C VT1 The upper voltage drops to 0, the main switch S 2 Is conducted by the body diode of (1), leakage inductance L k1 Terminal voltage is-uo/(8N), leakage inductance current I Lk1 Linear decrease, inductor current I L1 、I L2 At the input power supply u in Is linearly increased by the excitation of (a); the process continues until the main switch S 1 Ending when the drive signal of (2) is on.
(10) State 10 (t) 9 ～t 10 ). At the position oft 9 Time master switch S 1 The main switch S is turned on because its body diode is already turned on 1 Realize zero-voltage turn-on and leakage inductance current I Lk1 Continuing the linear decrease, the process continues until the leakage inductance current I Lk1 Down to inductor current I L1 And ending the process.
(11) State 11 (t) 10 ～t 11 ). At t 10 Time leakage inductance current I Lk1 Down to inductor current I L1 Main switch S 1 The current of (2) is reversed at this time and the process continues until the leakage inductance current I Lk1 Ending when the drop reaches 0. Transformer secondary diode D 21 、D 22 The current of (2) also drops to 0. Notably the leakage inductance current I Lk1 Control of the falling rate, diode D 21 、D 22 The current dropping rate of the diode is effectively controlled, the close zero current turn-off is realized, and the reverse recovery loss of the diode can be effectively reduced. At t 10 After the moment in time, the secondary diode D 21 、D 31 、D 41 、D 11 、D 22 、D 32 、D 42 、D 0 All are turned off reversely, the main switch S 1 、S 2 All are conducted, inductance current I L1 、I L2 At the input power supply u in Is linearly rising in accordance with state 1.
In the second input phase, the main switch S 2 Auxiliary switch S TC2 Switch-on/switch-off state of (2) and main switch S 1 Auxiliary switch S TC1 Is similar. The second input phase operates in the same state as the fourth input phase. And will not be described in detail.
The third input phase operates the same as the first input phase, diode D in state 3 41 、D 42 Conduction, the secondary side induction current of the transformer passes through D 41 Give electric capacity C 41 Charging, capacitor C 31 Discharging while passing through diode D 42 Give electric capacity C 42 Charging, capacitor C 32 And (5) discharging.
Through the analysis, the converter can realize automatic current sharing, and the 180-degree phase shift parallel staggered control mode shares input current through four input inductors, so that high voltage boosting is realized, and meanwhile, the current stress and switching loss of components can be effectively reduced. The zero-current turn-off of the diode is realized while the voltage spike of the switching tube is suppressed.
Simulation parameters: all switching frequencies f=50 kHz, transformer transformation ratio n=1, main switching duty cycle d=0.7, input voltage u in =30v, output voltage u 0 Near 800V, power P 0 =1200w. It can be seen that the currents flowing through the 4 inductors are equal, and each module automatically equalizes. Zero-voltage conduction of the switching tube is realized, zero-current turn-off is realized by the diode, and voltage stress peaks of the switching tube are limited.
Claims (1)
1. The utility model provides a high isolation type DC/DC converter that steps up of modularization input phase number adjustable which characterized in that: the converter comprises a DC input source, m modules, and diodes D 0 Output filter capacitor C 0 Load R L ；
Wherein m modules are as follows:
the first module comprises: inductance L 1 Power switch S 1 Connected in parallel with the power switch S 1 Capacitance C of drain and source VT1 Auxiliary switch S TC1 Clamping capacitor C C1 Leakage inductance L K1 Isolation transformer T 1 Diode D 1 2 、D 1 3 ···D 1 n Capacitance C 1 2 、C 1 3 ···C 1 n ；
Inductance L 1 Is connected with the positive electrode of an input power supply, and the inductance L 1 The other end of (2) is connected with leakage inductance L K1 Is one end of the inductance L 1 At the same time with the power switch S 1 Is a drain of (d) and clamp auxiliary switch S TC1 Is connected with the source electrode of the transistor; power switch S 1 Source of (C) and clamping capacitor (C) C1 The other end is connected and then grounded; auxiliary switch S TC1 Drain of (C) and clamp capacitor C C1 One end is connected; leakage inductance L K1 And the other end of the transformer T 1 One end of the primary side is connected; transformer T 1 One end of the secondary side and a diode D 2 1 Anode of (C) and capacitor C 1 2 、C 1 3 ···C 1 n Is connected to the other end of the transformer T 1 One end of the secondary side is simultaneously connected with the filter capacitor C o Another end of (C) and load R L Is connected with the other end of the connecting rod; diode D 1 2 Cathode and capacitor C of (2) 1 2 Is connected to one end of diode D 1 3 Cathode and capacitor C of (2) 1 3 Diode D is connected to one end of the same 1 n Cathode and capacitor C of (2) 1 n Is connected with one end of the connecting rod;
the second module comprises: inductance L 2 Power switch S 2 Connected in parallel with the power switch S 2 Capacitance C of drain and source VT2 Auxiliary switch S TC2 Clamping capacitor C C2 Leakage inductance L K2 Isolation transformer T 2 Diode D 2 1 、D 2 2 ···D 2 n Capacitance C 2 1 、C 2 2 ···C 2 n ；
Inductance L 2 Is connected with the positive electrode of an input power supply, and the inductance L 2 The other end of (2) is connected with leakage inductance L K2 Is one end of the inductance L 2 At the same time with the power switch S 2 Is a drain of (d) and clamp auxiliary switch S TC2 Is connected with the source electrode of the transistor; power switch S 2 Source of (C) and clamping capacitor (C) C2 The other end is connected and then grounded; auxiliary switch S TC2 Drain of (C) and clamp capacitor C C2 One end is connected; leakage inductance L K2 And the other end of the transformer T 2 One end of the primary side is connected; transformer T 2 One end of the secondary side is provided with a capacitor C 2 1 、C 2 2 ···C 2 n Is connected with the other end of the connecting rod; diode D 2 1 Cathode and capacitor C of (2) 2 1 Is connected to one end of diode D 2 2 Cathode and capacitor C of (2) 2 2 Diode D is connected to one end of the same 2 n Cathode and capacitor C of (2) 2 n Is connected with one end of the connecting rod;
the third module comprises: inductance L 3 Power switch S 3 Connected in parallel with the power switch S 3 Capacitance C of drain and source VT3 Auxiliary switch S TC3 Clamping capacitor C C3 Leakage inductance L K3 Isolation transformer T 3 Diode D 3 1 、D 3 2 ···D 3 n Capacitance C 3 1 、C 3 2 ···C 3 n ；
Inductance L 3 Is connected with the positive electrode of an input power supply, and the inductance L 3 The other end of (2) is connected with leakage inductance L K3 Is one end of the inductance L 3 At the same time with the power switch S 3 Drain of (d) and clamp auxiliary switch S TC3 Is connected with the source electrode of the transistor; power switch S 3 Source of (C) and clamping capacitor (C) C3 The other end is connected and then grounded; auxiliary switch S TC3 Drain of (C) and clamp capacitor C C3 One end is connected; leakage inductance L K3 And the other end of the transformer T 3 One end of the primary side is connected; transformer T 3 One end of the secondary side is provided with a capacitor C 3 1 、C 3 2 ···C 3 n Is connected with the other end of the connecting rod; diode D 3 1 Cathode and capacitor C of (2) 3 1 Is connected to one end of diode D 3 2 Cathode and capacitor C of (2) 3 2 Diode D is connected to one end of the same 3 n Cathode and capacitor C of (2) 3 n Is connected with one end of the connecting rod;
....:
the module m includes: inductance L m Power switch S m Connected in parallel with the power switch S m Capacitance C of drain and source VTm Auxiliary switch S TCm Clamping capacitor C Cm Leakage inductance L Km Isolation transformer T m Diode D m 1 、D m 2 ···D m n Capacitance C m 1 、C m 2 ···C m n ；
Inductance L m Is connected with the positive electrode of an input power supply, and the inductance L m The other end of (2) is connected with leakage inductance L Km Is one end of the inductance L m At the same time with the power switch S m Drain of (d) and clamp auxiliary switch S TCm Is connected with the source electrode of the transistor; power switch S m Source of (C) and clamping capacitor (C) Cm The other end is connected and then grounded; auxiliary switch S TCm Drain of (C) and clamp capacitor C Cm One end is connected; leakage inductance L Km Is arranged at the other end of (2)And transformer T m One end of the primary side is connected; transformer T m One end of the secondary side is sequentially connected with the capacitor C m 1 、C m 2 ···C n m Is arranged at the other end of the tube; diode D m 1 Cathode and capacitor C of (2) m 1 Is connected to one end of diode D m 2 Cathode and capacitor C of (2) m 2 Diode D is connected to one end of the same m n Cathode and capacitor C of (2) m n Is connected with one end of the connecting rod; diode D m n Cathode and capacitor C of (2) m n And diode D 0 Is connected with the anode of the battery;
the connection relation between the modules is as follows:
transformer T in module I 1 One end of the secondary side is provided with a capacitor C 1 2 The node between the other ends is connected with a diode D in a second module 2 1 Anode of diode D in module one 1 2 Cathode and C 1 2 The node between one end is connected with the diode D in the second module 2 2 Anode of diode D in module one 1 3 Cathode and C 1 3 The node between one end is connected with the diode D in the second module 2 3 The anode of (D) in module one, and so on 1 n Cathode and capacitor C of (2) 1 n The node between one end is connected with the diode D in the second module 2 n An anode of (a);
diode D in module II 2 1 Cathode and C 2 1 The node between one ends is connected with the diode D in the module III 3 1 Anode of diode D in module II 2 2 Cathode and C 2 2 The node between one ends is connected with the diode D in the module III 3 2 Anode, and so on, diode D in module two 2 n Cathode and C 2 n The node between one ends is connected with the diode D in the module III 3 n An anode;
....:
diode D in module m-1 m-1 1 Cathode and capacitor C m-1 1 The node between one ends is connected with the diode D in the module m m 1 Diode D in module m-1 m-1 2 Cathode and capacitor C m-1 2 The node between one ends is connected with the diode D in the module m m 2 Is a cathode of a battery..., and so on, diode D in module m-1 m-1 n Cathode and capacitor C of (2) m-1 n The node between one ends is connected with the diode D in the module m m n An anode of (a);
diode D in module m m 1 Cathode and capacitor C m 1 The node between one end is connected with diode D in module one 1 2 Anode of diode D in module m m 2 Cathode and capacitor C m 2 The node between one end is connected with diode D in module one 1 3 The anode of (D) in module m, and so on m n-1 Cathode and capacitor C m n-1 The node between one end is connected with diode D in module one 1 n An anode of (a);
load R L And C 0 Parallel, load R L One end connected with diode D 0 The other end of the cathode is connected to a module-one middling pressure device T 1 One end of the secondary side is provided with a capacitor C 1 2 Nodes between the other ends; diode D 0 Anode and diode D of (c) m n Cathode and capacitor C of (2) m n Is connected with the node between one ends of the two; the other ends of the primary sides and the secondary sides of the transformers between the modules are connected together;
m power switches S of the converter 1 、S 2 ...S m The grid electrodes of the auxiliary switches S are respectively connected with respective controllers TC1 、S TC2 ...S TCm The grid electrodes of the power switches S are also respectively connected with the respective controllers, and the subscript is odd 1 、S 3 Control signals are consistent, and the subscripts are even power switches S 2 、S 4 The control signals are identical and the two are 180 degrees out of phase, and the auxiliary clamp switch is complementarily conducted with the power switch of the corresponding branch.
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| CN203942447U (en) * | 2014-07-02 | 2014-11-12 | 三峡大学 | A kind of ZVT crisscross parallel high-gain formula DC/DC converter |
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| CN107086785A (en) * | 2017-06-27 | 2017-08-22 | 厦门大学 | A kind of Sofe Switch implementation method of single-phase high-gain boost converter |
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| US8189351B2 (en) * | 2007-02-23 | 2012-05-29 | Astec International Limited | Multi-input DC/DC converters with zero-current switching |
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|---|---|---|---|---|
| CN203942447U (en) * | 2014-07-02 | 2014-11-12 | 三峡大学 | A kind of ZVT crisscross parallel high-gain formula DC/DC converter |
| CN106849681A (en) * | 2017-04-11 | 2017-06-13 | 厦门大学 | A kind of high-gain isolated active clamping Sofe Switch DC DC converters |
| CN107086785A (en) * | 2017-06-27 | 2017-08-22 | 厦门大学 | A kind of Sofe Switch implementation method of single-phase high-gain boost converter |
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Application publication date: 20181023 Assignee: Nanjing Chixun Electric Technology Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980049857 Denomination of invention: A Modular Input Phase Adjustable High Boost Isolation DC-DC Converter Granted publication date: 20231027 License type: Common License Record date: 20231206 |